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Half-Pint

I need to determine if this bike I recently bought has Ny sort of tuner on it. It has a CFR pipe so one would think there would be. Where would I look on the bike to find one if the PO did in fact install something?

Depending on what model year bike you have, it may be under the pillon seat. If the PO didn't install a high flow air filter he probably didn't install a tuner. These bikes are very air flow restricted in stock form. Both the intake snorkel and OEM air filter are restrictive. Do not install a high flow air filter without a tuner. These bikes run way too lean on factory settings and will run even leaner if you open the exhaust and air flow without increasing gas flow.

I need to determine if this bike I recently bought has Ny sort of tuner on it. It has a CFR pipe so one would think there would be. Where would I look on the bike to find one if the PO did in fact install something?

The engine management system has probably been flashed, either with a proper dyno tune or a stage one flash. If there is a tuner it will be close to the EMS and there will be a shot, thick wire with a big plug between the two.

Most likely a "stage 1" flash by the dealer, which will be good enough if it seems to run right.

__________________
Louis

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It seems to run pretty well. Hard to say for sure though as this is my first vtwin. I do notice popping on decel and on occassion under hard throttle there is like a slight miss probably somewhere around 4k rpms. I noticed it like three or four times now. Inside of pipe is black which seems to indicate it running rich. I pulled off the air box lid to see if that leans it out a bit. It could also have a cam for all I know. Seeps pretty lopey, but again, first vtwin.

1) A piggy back tuner, which intercepts the bike's own engine management system instructors to the fuel injectors and changes them.

2) Changing the maps in the bike's own engine management system.

Within 1) you can have systems that try and tune themselves, or systems you tune on a dyno or by crossing your fingers and using someone elses map.

Within 2), you can:

a) Get the dealer to put one of a range of pre-rolled tunes on via their "digital technician". This costs very little.

b) Use Harley's own interface, called a SEPST. This is a $20 interface on most bikes for which Harley charge you an outrageous $500. It is locked to one bike. If this had been used on yours it should have been given to you. You still need either a dyno run or some kind of fuel ratio logging tool like a Twinscan. There is a sort of SEPST clone called the Mastertune which is better and a bit cheaper, but the dealer may be unfamiliar with it.

c) Use Dynojet's new Power Vision. This does all sorts of clever things and in my view makes the SEPST obsolete. You can add the Autotune module to do your own tune.

I would guess yours has had a Stage 1 flash. The bikes run rather lean around 4K. You are probably going the wrong way leaning it off. If it seems the previous owner has put some miles on it, and it runs OK, and you don't want to spend a packet, I would leave well alone. If it has few miles, feels a bit off, and you have spare cash, I'd get a Power Vision and autotune module and have fun fiddling.

I'm assuming a fairly late model (08+) bike.

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Louis

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It means the autotune stuff probably won't work on the exhausts you have, because there are no holes for the probes. You can cut/weld in holes, but it is a pain. It also means, I think, that if it has been tuned with the tool Harley sells to end users, it will be a SERT, not a SEPST (someone else might like to check the dates on that, I came in in 2007).

So I'd say if it works leave well alone, and if you have problems, ebay for a Power Commander III and get a basic dyno run.

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Louis

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